March 1, 2010 – Windows 7 RC pre-expiration shut downs begin. Beginning March 1, the Windows 7 Release Candidate (RC) will start to shut down every two hours in preparation for its expiration on June 1, 2010. That means you will need to migrate your RC systems to a released to manufacturing (RTM) version of Windows 7; or your previous operating system. Remember to back up all your data as either option will require a clean installation. For more information, read this post on the Windows Team blog.